(04 Apr 2018, 1:17 am)JM03 wrote The incident caused chaos. I didn't hear about a ambulance at the time but all i saw was the buses crash.

I arrived about 17.40, into the tail end of it all - the ambulance was parked on one of the stands in the middle of the bus station, but left a few minutes later.  It didn't use blue lights or sirens when it left, so no emergency case on board.  I guess, given the nature of Haymarket, it's likely that there were standing passengers who may have fallen over as a result of the collision, and who therefore needed a medical check-over to make sure they were OK.